<?php
class Bar {};
class Bla extends Bar {};
class Foo extends Bla {};
$foo = new Foo();
$className = 'Bar';
var_dump(is_subclass_of($foo, $className));
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
bool(true)